<![CDATA[Problem with passing object of my class as parameter to other object.]]>Hi,

I'm working on text editor in Qt and I have a small problem. There are 2 classes MainWindow and Editor and what I'm trying to do is to pass one of the as a parameter to the other.

Here is the LINK to gist containing header files of that 2 classes.

If I compile this code it gives me two errors:

  • editor.h:13: error: expected ')' before '*' token
Editor(MainWindow *parent, QString path, QString name, QString content);
  • editor.h:23: error: 'MainWindow' does not name a type
MainWindow *parent;

Thanks for help.

]]>https://forum.qt.io/topic/65786/problem-with-passing-object-of-my-class-as-parameter-to-other-objectRSS for NodeSat, 24 Oct 2026 23:28:11 GMTTue, 05 Apr 2016 14:24:10 GMT60<![CDATA[Reply to Problem with passing object of my class as parameter to other object. on Tue, 05 Apr 2016 20:04:01 GMT]]>Hi,

That circular dependency triggers another question: why do you need it ? Sounds like you are preparing a tight coupling between these two classes and it's something you should avoid.

]]>https://forum.qt.io/post/321015https://forum.qt.io/post/321015Tue, 05 Apr 2016 20:04:01 GMT<![CDATA[Reply to Problem with passing object of my class as parameter to other object. on Tue, 05 Apr 2016 18:36:26 GMT]]>Thanks a lot guys, forward declaration solved it.

]]>https://forum.qt.io/post/321007https://forum.qt.io/post/321007Tue, 05 Apr 2016 18:36:26 GMT<![CDATA[Reply to Problem with passing object of my class as parameter to other object. on Tue, 05 Apr 2016 17:25:39 GMT]]>I was going to suggest the same as @jsulm. Use forward declaration of MainWindow in your header and include the header in your CPP.

]]>https://forum.qt.io/post/320995https://forum.qt.io/post/320995Tue, 05 Apr 2016 17:25:39 GMT<![CDATA[Reply to Problem with passing object of my class as parameter to other object. on Tue, 05 Apr 2016 15:44:27 GMT]]>Don't forget to include MainWindow in Editor.cpp

]]>https://forum.qt.io/post/320985https://forum.qt.io/post/320985Tue, 05 Apr 2016 15:44:27 GMT<![CDATA[Reply to Problem with passing object of my class as parameter to other object. on Tue, 05 Apr 2016 15:43:40 GMT]]>You have circular includes: MainWindow includes Editor and Editor includes MainWindows. This is not going to work.
If you only use pointer to MainWindow in Editor you can remove the include and add forward declaration:

class MainWindow;
]]>https://forum.qt.io/post/320984https://forum.qt.io/post/320984Tue, 05 Apr 2016 15:43:40 GMT<![CDATA[Reply to Problem with passing object of my class as parameter to other object. on Tue, 05 Apr 2016 14:47:16 GMT]]>@mrjj Hi, thanks for fast reply. Include is not the issue here, if you look at the gist I've posted link to, you'll see that I have "mainwindow.h" included in "editor.h".

]]>https://forum.qt.io/post/320978https://forum.qt.io/post/320978Tue, 05 Apr 2016 14:47:16 GMT<![CDATA[Reply to Problem with passing object of my class as parameter to other object. on Tue, 05 Apr 2016 14:32:15 GMT]]>@cmoud94 said:

MainWindow' does not name a type

hi, this sounds like you did not include "mainwindow.h"
so it knows that type?

]]>https://forum.qt.io/post/320975https://forum.qt.io/post/320975Tue, 05 Apr 2016 14:32:15 GMT